use selectors to identifer menu items instead of String titles
Issue#26 remove duplicate keyframes when copying and pasting
Merge branch 'develop' of https://github.com/apportable/SpriteBuilder into develop
@Issue#52 setfocus to scrubber when selecting keyframes.
@Issue#33 Add hotkey for Skew Keyframe
@Issue#22 Add override argument to unzip process when creating new projects.
@Issue#21 Fixed up afconvert commandline parameters to work for m4a's
Merge pull request #53 from jtwigg/develop

Develop